使用Lambda表达式的LINQ查询

Question

I have this linq query, which is working fine, but I want to make it shorter by using a lambda expression. Any suggestions or examples might help.

selectedPersons = (from d in entities.PERSONS_DATA
                   where d.PERSON_ID == pid
                   select d).First();

Answer 1

selectedPersons = entities.PERSONS_DATA.First (d => d.PERSON_ID == pid);

Answer 2

If you can use:

electedPersons = entities.PERSONS_DATA.Find(pid);

If there is a chance the pid might not match a row the First will throw an exception. So in this case use:

electedPersons = entities.PERSONS_DATA.FirstOrDefault(d => d.PERSON_ID == pid);

if(electedPersons != null)
   ....